[MEncoder-users] h264 (and help with encoding) or divx
Brian Penick
bydivinerite at gmail.com
Fri Mar 7 20:43:18 CET 2008
Sorry, the nob_pyramid. won't help with the blocking, only the choppiness.
The cpu in the xbox isn't fast enough to handle the b_pyramid option because
it requires extra decoding time due to the fact that it allows b-frames to
be predicted off of other b-frames. The problem is that the reference
b-frames also have to be predicted from a P or I frame. So it results in
extra decoding time before a frame can be displayed. As far as the blocking
is concerned try taking out the 8x8dct option and setting partitions=all
(this option dependent on how new your mencoder version is). You could try
using the pp deblocking video filters before encoding. Also I believe crf
was designed for single pass video encoding which negates all of your qp
settings the x264 codec will ignore them for crf. Pretty sure you have to
set a bitrate for multipass encoding. Lastly I think setting qpmax to 51
might result in some bad quality still frames because it'll pull the bitrate
to motion scenes try setting it to 31.
On Fri, Mar 7, 2008 at 12:58 AM, Alex Samad <alex at samad.com.au> wrote:
> On Wed, Mar 05, 2008 at 07:14:29PM -0600, Brian Penick wrote:
> > I suggest changing b_pyramid to nob_pyramid, subq=7 to subq=6 (you
> shouldn't
> > notice a drop in quality at all but it will speed up the encode), and
> > frameref=4 to frameref=2. Optionally you could increase the b_bias to
> 20
> > (b_bias=20) to favor bframes a little more since b_adapt still strongly
> > favors P frames even when the image is totally still. But I'm pretty
> sure
> > your biggest issue here is the b_pyramid option.
> Hi
>
> Is there a simple way of explaing why this option is giving me the
> blockiness. The mn pages in mencoder only talk about referencing
> B-Frames
>
> Thanks
>
> >
> > On Tue, Mar 4, 2008 at 6:36 PM, Alex Samad <alex at samad.com.au> wrote:
> >
> > > Hi
> > >
> > > I am in the process of processing my video camera footage I have
> taken.
> > >
> > > I was hoping to go to h264, but testing the resultant files on my xbox
> > > (xbmc), it is very choppy, it can't seem to keep up (also encoding
> sound
> > > to aac). So I am thinking to either go back to encoding with divx or
> > > buy an xbox360 ?
> > >
> > > I would like to stay with h264 it saves a lot of space.
> > >
> > > My other problem with x264 is I get boxy area's when the back ground
> is
> > > a wall, with a visible light gradient (you can see it get darker the
> > > further away it is). This looks okay in the original format, but when
> > > encoded with x264 it goes all blocky and not smooth at all
> > >
> > > these are the flags I am using
> > >
> > >
> H264COMMON=":frameref=4:mixed_refs:bframes=16:b_adapt:b_pyramid:weight_b:bime:direct_pred=auto:me=umh:me_range=24:subq=7:brdo:chroma_me:trellis=1:cabac:deblock:8x8dct:partitions=p8x8,b8x8,i8x8,i4x4:nofast_pskip:nodct_decimate:threads=auto:keyint=250:qp_min=10:qp_max=51:ip_factor=
> > > 1.4:pb_factor=1.3:qcomp=0.6:qblur=0.5:chroma_qp_offset=0"
> > >
> > > ENC1="x264 -x264encopts pass=1:crf=18:turbo$H264COMMON"
> > > ENC2="x264 -x264encopts pass=3:bitrate=$BITRATE$H264COMMON"
> > >
> > > AENC="-af volnorm=1"
> > >
> > > FILTER1=""
> > >
> > > FILTER2="-vf spp,hqdn3d=2:1:2"
> > >
> > > AUDIO="-oac faac -faacopts object=1:tns:quality=300:mpeg=4"
> > >
> > > ASPECT="-aspect 16:9"
> > >
> > > ADDOPT=
> > >
> > >
> > > echo "Video Pass 1/3"
> > > nice mencoder $QUIET \
> > > $ASPECT \
> > > -alang en\
> > > $FILTER1 \
> > > -ovc $ENC1 \
> > > -nosound \
> > > -passlogfile "$PASSLOG" \
> > > -o /dev/null \
> > > "$INFILE" $ADDOPT
> > >
> > > echo "Video & Audio Pass 2/3"
> > > nice mencoder $QUIET \
> > > $ASPECT \
> > > -alang en\
> > > $FILTER2 \
> > > $AENC \
> > > -ovc $ENC2 \
> > > -passlogfile "$PASSLOG" \
> > > $AUDIO \
> > > -o "$AVIFILE" \
> > > "$INFILE" $ADDOPT
> > >
> > > echo "Video & Audio Pass 3/3"
> > > nice mencoder $QUIET \
> > > $ASPECT \
> > > -alang en\
> > > $FILTER2 \
> > > $AENC \
> > > -ovc $ENC2 \
> > > -passlogfile "$PASSLOG" \
> > > $AUDIO \
> > > -o "$AVIFILE" \
> > > "$INFILE" $ADDOPT
> > >
> > >
> > > echo "Extract Video"
> > > nice MP4Box -aviraw video "$AVIFILE" > "$WRKDIR/aviraw_video.out" &
> > > WAITPD="$!"
> > >
> > > # Extracts to ${BFILE}_audio.raw
> > > echo "Extract Audio"
> > > nice MP4Box -aviraw audio "$AVIFILE" > "$WRKDIR/aviraw_audio.out" &
> > > WAITPD="$WAITPD $!"
> > >
> > > wait $WAITPD
> > >
> > > mv $SNDFILERAW $SNDFILEAAC
> > >
> > > echo "Make mp4"
> > > MP4Box -add "$VIDFILERAW" -add "$SNDFILEAAC" -fps 25 -new
> > > "${OUTFILE}" > "$WRKDIR/MP4Box.out"
> > >
> > >
> > >
> > > What can I do to smooth out these ares with out loosing too much
> > > definition in the for ground.
> > >
> > > Also how can I use mplayer (or mencoder) to output to a jpg a specific
> > > frame (or time reference) so I can give examples
> > >
> > > Thanks
> > >
> > >
> > > -
> > > "The march to war affected the people's confidence. It's hard to make
> > > investment. See, if you're a small business owner or a large business
> owner
> > > and you're thinking about investing, you've got to be optimistic when
> you
> > > invest. Except when you're marching to war, it's not a very optimistic
> > > thought, is it? In other words, it's the opposite of optimistic when
> you're
> > > thinking you're going to war."
> > >
> > > - George W. Bush
> > > 02/09/2004
> > > Springfield, MO
> > >
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> > >
> > > _______________________________________________
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> > >
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> >
>
> --
> Chemist who falls in acid is absorbed in work.
>
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